Abstract
The oxidation of hydroxylamine on the three low index faces of Au single crystal has been investigated by cyclic voltammetry in buffered aqueous solutions in the pH range 1-7 under quiescent conditions. The results obtained have shown that the onset potential for the reaction on Au(100) is more negative, and the current in the region of small overpotentials is higher than for Au(110) and Au(111) regardless of the pH of the solution. Measurements performed in phosphate buffer (pH 7) with single crystal rotating disk electrodes in the hanging meniscus configuration yielded rather linear Tafel slopes in the small overpotential region for Au(111) and Au(110), which were higher than those found for Au(100). This affords clear evidence that the mechanism for this latter surface is different that for the other two faces involving in all likelihood one or more yet to be identified adsorbed intermediates.
| Original language | English |
|---|---|
| Pages (from-to) | 911-915 |
| Number of pages | 5 |
| Journal | ACS Catalysis |
| Volume | 2 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2012 May 4 |
| Externally published | Yes |
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Keywords
- Au electrode
- hydroxylamine
- rotating hanging meniscus
- single crystal
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
Cite this
Pronounced surface sensitivity of hydroxylamine oxidation on gold single-crystal electrodes in acidic and neutral aqueous solutions. / Jebaraj, Adriel Jebin Jacob; Martins De Godoi, Denis Ricardo; Scherson, Daniel Alberto.
In: ACS Catalysis, Vol. 2, No. 5, 04.05.2012, p. 911-915.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Pronounced surface sensitivity of hydroxylamine oxidation on gold single-crystal electrodes in acidic and neutral aqueous solutions
AU - Jebaraj, Adriel Jebin Jacob
AU - Martins De Godoi, Denis Ricardo
AU - Scherson, Daniel Alberto
PY - 2012/5/4
Y1 - 2012/5/4
N2 - The oxidation of hydroxylamine on the three low index faces of Au single crystal has been investigated by cyclic voltammetry in buffered aqueous solutions in the pH range 1-7 under quiescent conditions. The results obtained have shown that the onset potential for the reaction on Au(100) is more negative, and the current in the region of small overpotentials is higher than for Au(110) and Au(111) regardless of the pH of the solution. Measurements performed in phosphate buffer (pH 7) with single crystal rotating disk electrodes in the hanging meniscus configuration yielded rather linear Tafel slopes in the small overpotential region for Au(111) and Au(110), which were higher than those found for Au(100). This affords clear evidence that the mechanism for this latter surface is different that for the other two faces involving in all likelihood one or more yet to be identified adsorbed intermediates.
AB - The oxidation of hydroxylamine on the three low index faces of Au single crystal has been investigated by cyclic voltammetry in buffered aqueous solutions in the pH range 1-7 under quiescent conditions. The results obtained have shown that the onset potential for the reaction on Au(100) is more negative, and the current in the region of small overpotentials is higher than for Au(110) and Au(111) regardless of the pH of the solution. Measurements performed in phosphate buffer (pH 7) with single crystal rotating disk electrodes in the hanging meniscus configuration yielded rather linear Tafel slopes in the small overpotential region for Au(111) and Au(110), which were higher than those found for Au(100). This affords clear evidence that the mechanism for this latter surface is different that for the other two faces involving in all likelihood one or more yet to be identified adsorbed intermediates.
KW - Au electrode
KW - hydroxylamine
KW - rotating hanging meniscus
KW - single crystal
UR - http://www.scopus.com/inward/record.url?scp=84860734064&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84860734064&partnerID=8YFLogxK
U2 - 10.1021/cs300032n
DO - 10.1021/cs300032n
M3 - Article
AN - SCOPUS:84860734064
VL - 2
SP - 911
EP - 915
JO - ACS Catalysis
JF - ACS Catalysis
SN - 2155-5435
IS - 5
ER -